Marinate tomatoes in balsamic vinegar for 30 minutes. Lay on a baking sheet, season with salt and pepper. Bake for 7 minutes at 350 degrees. Then top with sautéed spinach and mozzarella. Broil until cheese melts.

Marinate tomatoes in balsamic vinegar for 30 minutes. Lay on a baking sheet, season with salt and pepper. Bake for 7 minutes at 350 degrees. Then top with sautéed spinach and mozzarella. Broil until cheese melts.